Yekta, Yasin, Hadipour, Hanif, Jafari, Seyed Akbar (2023) Tunning the tilt of the Dirac cone by atomic manipulations in 8Pmmn borophene. Communications Physics, 6 (1). Article Number 46. ISSN 2399-3650. (doi:10.1038/s42005-023-01161-9) (KAR id:100490)
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Official URL: https://doi.org/10.1038/s42005-023-01161-9 |
Abstract
Two dimensional quantum materials possessing Dirac cones in their spectrum are fascinating due to their emergent low-energy Dirac fermions. In 8Pmmn borophene the Dirac cone is furthermore tilted, which is a proxy for spacetime geometry, since the future light-cone depends on the underlying metric. Therefore it is important to understand the microscopic origin of the tilt. Here, based on ab-initio calculations, we decipher the atomistic mechanism of the formation of tilt. First, nearest-neighbor hopping on a buckled honeycomb lattice forms an upright Dirac cone. Then, the difference in the renormalized anisotropic second-neighbor hopping, formed by virtual hoppings on one-dimensional chains of atoms, tilts the Dirac cone. We construct an accurate tight-binding model on honeycomb graph for analytical investigation, and we find that substitution of certain boron atoms by carbon provides a way to change the tilt of the cone.
Item Type: | Article |
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DOI/Identification number: | 10.1038/s42005-023-01161-9 |
Subjects: |
Q Science Q Science > QB Astronomy Q Science > QC Physics |
Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
SWORD Depositor: | JISC Publications Router |
Depositing User: | JISC Publications Router |
Date Deposited: | 18 Apr 2023 13:02 UTC |
Last Modified: | 19 Apr 2023 11:11 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/100490 (The current URI for this page, for reference purposes) |
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